US inflation jumps to 3.7% in September as Iran war drives gasoline prices higher

US consumer inflation was hotter than anticipated in September, government data showed Wednesday, as Washington's war with Tehran pushed energy costs higher, deepening strains on American households ahead of next month's midterm elections.

The uptick underscores voter worries over high costs of living, and comes as President Donald Trump is campaigning in US states to shore up support for his Republican party as it tries to retain control of Congress.

Still, the consumer price index (CPI) was up more than analysts expected in September, rising 3.7 percent on a year-on-year basis, said the Department of Labor.

This was a notable acceleration from the 3.4 percent reading in August. Economists had forecast a slightly cooler reading of 3.6 percent, according to MarketWatch.

Inflation picked up pace month-on-month too, from 0.4 percent in August to 0.6 percent last month.

Gasoline costs accounted for more than half of the jump, surging 9.1 percent on a monthly basis, Wednesday's report said.

Excluding the volatile food and energy sectors, "core" CPI was up 2.6 percent from a year ago.